The car’s last known sale was in 2009, when an anonymous collector in Russia bought it for an unknown amount likely in the millions. This same owner is believed to be the one trying to unload it today, and has pledged to donate 10 percent of the sale price to the Simon Wiesenthal Center to help fund education about the Holocaust.

But while the $7 million bid didn’t meet the seller’s reserve price, the auction house tells The Arizona Republic that private negotiations for a sale will continue after the auction.

Prior to the auction, a top classic car valuation expert told Fox News that the rare car was likely worth $5 million to $7 million on its own merits without the Hitler connection.